In smaller sized greenhouses, a manual system opened and closed by hand could be installed. These work simplest when the screen materials is backed by a monitor system.
Start time – when each Motor Gearboxes For Greenhouse morning will the display system start operation
Stop period – when in the afternoon will the display screen system stop operation
Light level – in what light strength will the screen end up being activated either to open up or close
Maximum/minimum temperature – what exactly are the limitations of temperature desired
Maximum/minimum humidity – What are the limitations of humidity desired
Gap positions – this pieces the percent open or close placement under different circumstances such as in early stages a winter morning to lessen thermal shock or during the summer to provide better shading. The gap techniques and speed of motion can be controlled in some systems.
Time delay – below changeable 
climate this avoids frequent opening and closing
Wind speed – To reduce high temperature loss, the screen could be closed early below high wind speed conditions
Snow detection – this may open the screen and turn on the heat when it begins to snow.
The standard system uses nylon monofilament or stainless cables to support the screen materials. The screen material can possibly rest on top of the network of cables or end up being suspended by hooks from the cables. A gearmotor powers a drum or rack and pinion that movements the industry leading of the screen material. Control is either with a manual change or electronic controller.
Based on the over, the grower is required to enter the next parameters into the controller:
A climate station is needed to provide outdoor light level, temperature, humidity, wind and rain or snow conditions.